| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a conventional communication system for an observation satellite has restriction of observed data quantity to be sent to a ground reception station resulting in causing a long waiting time. SOLUTION: The communication system is provided with a storage relay ground station 4 that is installed at a place close to the pole and temporarily stores received observation data, an observation satellite 1A that collects observation data when passing up in the sky of an observation object 5 on ground surface, transmits the collected observation data to the ground reception station when passing through a visible area 20 of the ground reception station 2, and transmits the collected observation data to the storage relay ground station when passing through a visible area 40 of the storage relay station, and a data carrier satellite 3 that acquires the observation data of the observation satellite stored in the storage relay ground station when passing through the visible area of the storage relay ground station and transmits the observation data of the observation satellite captured in itself to the ground reception station when passing through the visible area of the ground reception station. Thus, the quantity of observation data to be sent can be increased and a waiting time until a state being able to transmit the observation data from the satellite to the ground station is possible can be decreased.
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